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Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped files

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From: Rik van Riel <riel@...>
To: Linus Torvalds <torvalds@...>
Cc: Ingo Oeser <ioe-lkml@...>, Miklos Szeredi <miklos@...>, <peterz@...>, <salikhmetov@...>, <linux-mm@...>, <jakob@...>, <linux-kernel@...>, <valdis.kletnieks@...>, <ksm@...>, <staubach@...>, <jesper.juhl@...>, <akpm@...>, <protasnb@...>, <r.e.wolff@...>, <hidave.darkstar@...>, <hch@...>
Subject: Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped files
Date: Friday, January 18, 2008 - 6:54 pm

On Fri, 18 Jan 2008 14:47:33 -0800 (PST)
Linus Torvalds <torvalds@linux-foundation.org> wrote:


There is one issue which is way more than just standards conformance.

When a program changes file data through mmap(), at some point the
mtime needs to be update so that backup programs know to back up the
new version of the file.

Backup programs not seeing an updated mtime is a really big deal.

-- 
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Messages in current thread:
[PATCH -v6 0/2] Fixing the issue with memory-mapped file times, Anton Salikhmetov, (Thu Jan 17, 6:31 pm)
Re: [PATCH -v6 0/2] Fixing the issue with memory-mapped file..., Miklos Szeredi, (Fri Jan 18, 5:40 am)
Re: [PATCH -v6 0/2] Fixing the issue with memory-mapped file..., Anton Salikhmetov, (Fri Jan 18, 3:48 pm)
Re: [PATCH -v6 0/2] Fixing the issue with memory-mapped file..., Miklos Szeredi, (Sat Jan 19, 6:45 am)
Re: [PATCH -v6 0/2] Fixing the issue with memory-mapped file..., Anton Salikhmetov, (Fri Jan 18, 6:31 am)
[PATCH -v6 2/2] Updating ctime and mtime for memory-mapped f..., Anton Salikhmetov, (Thu Jan 17, 6:31 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 5:51 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Peter Zijlstra, (Fri Jan 18, 6:15 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 6:38 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Peter Zijlstra, (Fri Jan 18, 7:00 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 7:17 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Peter Zijlstra, (Fri Jan 18, 7:23 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 7:36 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Peter Zijlstra, (Fri Jan 18, 6:25 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 1:58 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 2:11 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 2:43 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 2:57 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 3:08 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 3:22 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 3:35 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Ingo Oeser, (Fri Jan 18, 6:32 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 6:47 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Peter Staubach, (Mon Jan 21, 10:25 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Anton Salikhmetov, (Mon Jan 21, 10:36 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Rik van Riel, (Fri Jan 18, 6:54 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Matt Mackall, (Fri Jan 18, 8:50 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Sat Jan 19, 6:22 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Matt Mackall, (Sat Jan 19, 11:49 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Rik van Riel, (Sat Jan 19, 12:25 am)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Anton Salikhmetov, (Fri Jan 18, 3:58 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 4:22 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Anton Salikhmetov, (Fri Jan 18, 5:03 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 5:27 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Anton Salikhmetov, (Fri Jan 18, 6:04 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Linus Torvalds, (Fri Jan 18, 6:21 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Anton Salikhmetov, (Fri Jan 18, 6:35 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Rik van Riel, (Fri Jan 18, 2:28 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Miklos Szeredi, (Fri Jan 18, 2:51 pm)
Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapp..., Anton Salikhmetov, (Fri Jan 18, 6:39 am)
[PATCH -v6 1/2] Massive code cleanup of sys_msync(), Anton Salikhmetov, (Thu Jan 17, 6:31 pm)
Re: [PATCH -v6 1/2] Massive code cleanup of sys_msync(), Miklos Szeredi, (Fri Jan 18, 5:33 am)
Re: [PATCH -v6 1/2] Massive code cleanup of sys_msync(), Anton Salikhmetov, (Fri Jan 18, 6:30 am)